Vol. 16 No. 2 (2021)
Articles

Bone histology of Broad-snouted Caiman Caiman latirostris (Crocodylia: Alligatoridae) as tool for morphophysiological inferences in Crocodylia

Paulo Braga Mascarenhas-Junior
Laboratório Interdisciplinar de Anfíbios e Répteis, Universidade Federal Rural de Pernambuco (UFRPE), Recife, Pernambuco
Luís Bassetti
Laboratório de Ecologia Isotópica – CENA/USP, Piracicaba, São Paulo
Juliana Manso Sayão
Museu Nacional do Rio de Janeiro, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro
Published November 5, 2021
Keywords
  • Crocodylians,
  • growth rate,
  • ontogeny,
  • osteohistology
How to Cite
Mascarenhas-Junior, P., Bassetti, L. A., & Manso Sayão, J. (2021). Bone histology of Broad-snouted Caiman Caiman latirostris (Crocodylia: Alligatoridae) as tool for morphophysiological inferences in Crocodylia. Acta Herpetologica, 16(2), 109-121. https://doi.org/10.36253/a_h-10079

Abstract

Bone histology is an important tool for the interpretation of life patterns in animals of the past and extant fauna. The crocodylians have been studied as important inferential models for morphophysiological characteristics. We aimed to characterize the osteohistology of captive Caiman latirostris, identifying its microanatomy related to growth rates, ontogeny, and environmental conditions. We analyzed five pairs of humeri (proximal elements of the appendicular skeleton) and ribs (axial skeleton) of females’ caiman. Ribs showed, in general, woven-fibered tissues, with low vascularization and parallel-fibered bone and many resorption and erosion cavities. It presented lines of arrested growth (LAGs) in three individuals, without skeletochronological compatibility. Humeri showed a gradient of woven-fibered to parallel-fibered and lamellar-zonal bone as the individuals aging. We observed compacted coarse cancellous bone (CCCB) and a higher number of LAGs in older specimens. Ribs remodel faster than humerus, showing an intra-individual histovariability. The humeri indicated an evident growth pattern with different ontogeny stages and growth rates in different ages. Fast-growing tissues are uncommon in crocodylians, but basal metabolism and optimal growth conditions can lead to this. Bone histology of C. latirostris shows patterns that can be used as inferential models for extant and extinct groups, but we encourage further studies for a better understanding, under different environmental conditions, such as temperature and food availability.

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